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LOANS AND BORROWINGS - Long-term borrowings (Details) - CNY (¥)
¥ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Long-term borrowings by type    
Unsecured long-term loans and borrowings ¥ 112,500 ¥ 42,500
Secured long-term loans and borrowings 11,376,880 8,726,497
Long-term borrowings ¥ 11,489,380 ¥ 8,768,997